I talked to some guys today who had 2 batwing mowers they were 90 HP and they claimed they could cut tall grass at 8 to 9 MPH, these were the style bat wing mowers with 2 sling blade hooked to the center housing that spins. Each one was 15 feet.

The told me the setup was real reliable with Shultze batwings, but did say the machines lacked in maneuverability